thompson



lUNITED STATES PATENT OFFICE.

O. B. THOMPSON, OF HUDSON, OHIO.

LOCK.

Specification of Letters Patent No. 21,994, dated November 2, 1858.

To all 'whom it may concern:

Be it known that I, O. B. THOMPSON, of Hudson, in the county of Summit and State of Ohio, have invented a new and Improved Bank-Lock; and I do hereby declare that the following is afull, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which- Figure l, is a longitudinal section of my invention taken in the line m, Fig. 2. Fig. 2, is a transverse section of ditto, taken in the line m, fc', Fig. l. Fig. 3, is also a transverse section of ditto, taken in the line y, y, Fig. l. Fig. 4, is a detached view of the key of ditto.

Similar letters of reference indicate corresponding parts in the several figures.

This invention consists in the employment or use of a series of slotted tumblers and guards peculiarly arranged and placed in such relation with a bolt tumbler and adjust-able lever as hereinafter fully shown and described, that a very simple burglar and powder proof lock is obtained, one that may be cheaply constructed the tumblers rendered permutable and no parts liable to get out of repair.

To enable those skilled in the art to fully understand and construct my invention will proceed to describe it.

A, represents the case of the lock which is of the usual form constructed of any of the metals now used for such purpose.

B, is the bolt litted in the case A, in the usual manner so that it may slide freely back and forth. To one side of the bolt B, a tumbler C, is attached by a pivot a, said tumbler having a steel plate b, attached to its inner end, the plate l), extending to the inner end of the bolt. The tumbler has a longitudinal slot c, 'made through it with two slots (l, (Z, communicating with it, one at each end and projecting' downward at right angles as shown clearly in Fig. l, and a pin e, which is attached permanently to the case A, is fitted in the slot c.

Vithin the case A, a smaller case or box D, is formed. This case o-r box contains a series of tumblers y, and guards g. The tumblers and guards work on a shaft 7L, which is fitted transversely in a series of vertical and parallel plates z', which form compartments for the tumblers and guards, the plates 2', being attached to a plate y', which forms the back of the box or case D,

as shown clearly in Fig. 8. The tumblers f, below their axis or shaft 71., are curved a little toward the front side of the lock as shown at 72.', and the upper ends of each tumbler is slotted downward as sho-wn at L, Fig. 3. The guards g, are similar in shape to the tumblers f, and are formed of metal plate doubled or bent so as to form a sheath to receive the tumblers which are fitted snugly in the sheaths but still allowed to move therein, the shaft It, being the common axis for both. To the outer edge of each guard g, a bar z, is attached and the lower ends of these bars project a trifle below the guards as shown clearly in Fig. 3. The upper ends of the guards g, project a short distance above the upper ends of the tumblers f, and the slots 7L, of the tumblers are made in them at varying distances apart.

Below the tumbler box D, there is a chamber E, in which a series of slides y', are placed, said slides working in proper grooves and having vertical projections c, at their inner ends. The projections le, extend upward into the lower part of the tumbler box D. At the back part of the chamber E, there is placed a short metal plate Z, and behind said plate a piece of leather m, or other suit able yielding or elastic substance to serve as a buffer is placed. Against the outer' edge of each guard g, a spring n, bears, said springs having a tendency to keep the lower ends of the bars z', of the guards against the projections 7c, of the slides j.

The upper end of the tumbler box or case D, is slotted as shown at o, to allow the plate Z), of the bolt tumbler O, to pass thro-ugh, see Figs. l and 8. The outer ends of the slides j, are exposed at the front side of the case and a key F, see Fig. 4, which is formed by having a series of bits p, screwed into a plate Q, the bits p, being of varying lengths corresponding to the varying positions of the slots 71,, in the tumblers. The plate g, may be hinged to a case or box r,

so that the bits may be inclosed therein for bler box D. The bolt tumbler C, also has a spring cz, bearing upon its upper surface as shown clearly in Fig. l.

From the above description of parts it will be seen that when the pin e, is in the back or inner slot (l, of the bolt tumbler C, thel bolt B, cannot be thrown back, and it will also be seen thatwhen the plate b, rests on the tops of the tumblers f, the bolt tumbler will be retained in such position as to cause the pin e, to be in said slot. In order therefore to unlock the lock the plate ZJ, must be allowed to fall so that the pin c, may be in the slot c. This is effected as follows. The knob G, is so turned that the eccentric boss t, will throw up the bolt tumbler and plate b, the latter being by this means moved above the upper ends of the guards g, and allowing the same to be shoved toward the front part of the case. When the plate Z2, is raised, the bits p, of the key are pressed against the outer ends of the slides .7', and the latter pressed inward, so that the projections 7c, will actuate the guards g, and the latter by friction move the tumblers f, against a plate f', and as the bits y), of the key are'made of varying lengths corresponding to the varying positions of the slots 7L, it follows as a matter of course. that the guards g, will be pressed or forced over the tumblers f a distance corresponding to the length of the bits p, that actuate them and by withdrawing the key, the springs n, will force back the guards, the guards carrying the tumblers 7', with them and bringing t-he slots it, in line so that the plate ZJ, may descend therein and bring the pin e, into slot c, of the tumbler C. By turning the knob Gr, therefore after the key F, is withdrawn the bit s, of the knob arbor will enter a recess s, of the tumbler bolt and throw back the bolt. Nhen the bolt is shoved forward again and the lock locked, the bit s, depresses the bar H, which acts against the parts 72,', of the tumblers and throws them into their former positions so that the slots la, will be out of line with each other, the eccentric boss t, previously raising the plate b. The changes or permutations may be made at any time by removing the plate y', and placing the tumblers and guards differently on the shaft 7L', the bits p, of the key F, being correspondingly changed. The bits p, and tumblers are numbered so as to always insure a correct adjust-ment.

In case either of the slides j, become fixed or wedged tightly in consequence of burglars tampering with them, the slide may be driven inward so as to loosen the slides the plate Z, and buffer m, preventing the slides from being injured by the pounding.

By this invention the tumblers f, cannot be operated upon as usual and a pressure of the bolt tumbler obtained on the tumblers in order to ascertain the position of the slots 7L. There is no-t a positive connection between the slides j, and the tumblers f, and consequently there cannot be any certain operation in a pickable point of view.

Having thus described my invention what I claim as new and desire to secure by Letters Patent, is,

l. The tumblers and guards y, constructed and arranged substantially as shown and placed in such relation with the plate Z), of the bolt tumbler C, and slides j, to operate as and for the purpose set forth.

2. I also claim in combination with the above parts the bar H, arranged substantially as shown so as to be acted upon by the arbor bit s, to adjust'the tumblers f, as the bolt B, is shoved out from the case.

3. I further claim the plate Z, and buffer m, placed at the back part of the slide chamber E, substantially as and for the purpose set forth.

O. B. THOMPSON.

lVitnesses C. A. YOUNG, A. T. BRINSMADE. 

